Button-type secondary battery

Abstract

A button-type secondary battery includes an electrode assembly; a lower can having an accommodation space in which the electrode assembly is accommodated; an upper can coupled to the lower can to cover the accommodation space; a gasket sealing a gap between the lower can and the upper can and to electrically insulate the lower can from the upper can while being inserted into a coupled portion of the lower can and the upper can; and a first electrode tab including a first coupling part coupled to a first electrode of the electrode assembly and a second coupling part coupled between the gasket, which is disposed at the coupled portion of the lower can and the upper can, and the upper can. The second coupling part is coupled between the gasket and the upper can by a pressure generated when the lower and upper cans are coupled to each other.

The invention claimed is: 
     
         1 . A button-type secondary battery, comprising:
 an electrode assembly;   a lower can having an accommodation space in which the electrode assembly is accommodated;   an upper can coupled to the lower can to cover the accommodation space;   a gasket configured to seal a gap between the lower can and the upper can and to electrically insulate the lower can from the upper can while being inserted into a coupled portion of the lower can and the upper can;   a first electrode tab including a first coupling part coupled to a first electrode of the electrode assembly and a second coupling part coupled between the gasket, which is disposed at the coupled portion of the lower can and the upper can, and the upper can; and   a second electrode tab coupled to a second electrode of the electrode assembly,   wherein:   the second coupling part is coupled between the gasket and the upper can by a pressure generated when the lower can and the upper can are coupled to each other; and   at least a portion of the first electrode tab and at least a portion of the second electrode tab overlap each other along a longitudinal direction of the button-type secondary battery.   
     
     
         2 . The button-type secondary battery of  claim 1 , wherein the lower can comprises a bottom surface on which the electrode assembly is disposed, and a wall surface formed along an edge of the bottom surface to form the accommodation space,
 wherein the upper can comprises a cover surface configured to cover the accommodation space and a coupling surface formed along an edge of the cover surface and coupled to the wall surface,   wherein the gasket comprises an outer surface provided between the wall surface and the coupling surface, an inner surface provided inside the wall surface, and a connection surface provided between the wall surface and the cover surface to connect the outer surface to the inner surface, and   wherein the second coupling part is coupled between the connection surface and the cover surface.   
     
     
         3 . The button-type secondary battery of  claim 2 , wherein the first electrode tab further comprises a third coupling part coupled between the coupling surface and the outer surface while extending from the second coupling part,
 wherein the third coupling part is coupled between the coupling surface and the outer surface by a pressure generated when the wall surface and the coupling surface are coupled to each other.   
     
     
         4 . The button-type secondary battery of  claim 2 , wherein the first electrode tab further comprises an extension part provided between the first coupling part and the second coupling part to extend along a surface of the electrode assembly, and a fourth coupling part provided between the extension part and the second coupling part and bent to be in surface close contact with the inner surface disposed on the wall surface. 
     
     
         5 . The button-type secondary battery of  claim 4 , wherein an insulator having insulation is disposed between the extension part and the surface of the electrode assembly. 
     
     
         6 . The button-type secondary battery of  claim 2 , wherein an insulating tape is attached to the first coupling part corresponding to the wall surface. 
     
     
         7 . The button-type secondary battery of  claim 2 , wherein the second electrode tab connects the second electrode to the lower can. 
     
     
         8 . The button-type secondary battery of  claim 7 , wherein the second electrode tab comprises a fifth coupling part coupled to the second electrode of the electrode assembly and a sixth coupling part coupled between the gasket, which is disposed at the coupled portion of the lower can and the upper can, and the lower can,
 wherein the sixth coupling part is coupled between the gasket and the lower can by the pressure generated when the lower can and the upper can are coupled to each other.   
     
     
         9 . The button-type secondary battery of  claim 8 , wherein the second electrode tab further comprises seventh coupling part coupled between the wall surface and the outer surface while extending from the second b-sixth coupling part,
 wherein the seventh coupling part is coupled between the wall surface and the outer surface by a pressure generated when the wall surface and the coupling surface are coupled to each other.   
     
     
         10 . The button-type secondary battery of  claim 9 , wherein the second electrode tab further comprises an eighth coupling part provided between the fifth coupling part and the seventh coupling part and provided between the wall surface and the inner surface. 
     
     
         11 . A button-type secondary battery, comprising:
 an electrode assembly;   a lower can having an accommodation space in which the electrode assembly is accommodated;   an upper can coupled to the lower can to cover the accommodation space;   a gasket configured to seal a gap between the lower can and the upper can and to electrically insulate the lower can from the upper can while being inserted into a coupled portion of the lower can and the upper can;   a first electrode tab coupled to a first electrode of the electrode assembly; and   a second electrode tab including a first coupling part coupled to a second electrode of the electrode assembly and a second coupling part coupled between the gasket, which is disposed at the coupled portion of the lower can and the upper can, and the lower can,   wherein:   the second coupling part is coupled between the gasket and the lower can by a pressure generated when the lower can and the upper can are coupled to each other; and   at least a portion of the first electrode tab and at least a portion of the second electrode tab overlap each other along a longitudinal direction of the button-type secondary battery.   
     
     
         12 . The button-type secondary battery of  claim 11 , wherein the first electrode tab is configured to connect the first electrode of the electrode assembly to the upper can,
 wherein the first electrode tab comprises a third coupling part coupled to the first electrode of the electrode assembly and a fourth coupling part coupled between the gasket, which is disposed at the coupled portion of the lower can and the upper can, and the upper can, and   wherein the fourth coupling part is coupled between the gasket and the upper can by the pressure generated when the lower can and the upper can are coupled to each other.   
     
     
         13 . The button-type secondary battery of  claim 1 , wherein:
 the upper can comprises a cover surface configured to cover the accommodation space;   the lower can comprises a bottom surface on which the electrode assembly is disposed;   the cover surface and the bottom surface are spaced spart along a vertical direction of the button-type secondary battery;   the at least a portion of the first electrode tab is disposed between the cover surface of the upper can and the electrode assembly; and   the at least a portion of the second electrode tab is disposed between the electrode assembly and the bottom surface of the lower can.   
     
     
         14 . A button-type secondary battery, comprising:
 an electrode assembly;   a lower can having an accommodation space in which the electrode assembly is accommodated;   an upper can coupled to the lower can to cover the accommodation space;   a gasket configured to seal a gap between the lower can and the upper can and to electrically insulate the lower can from the upper can while being inserted into a coupled portion of the lower can and the upper can;   a first electrode tab including a first coupling part coupled to a first electrode of the electrode assembly and a second coupling part coupled between the gasket, which is disposed at the coupled portion of the lower can and the upper can, and the upper can; and   a second electrode tab coupled to a second electrode of the electrode assembly,   wherein:   the second coupling part is coupled between the gasket and the upper can by a pressure generated when the lower can and the upper can are coupled to each other;   at least a portion of the first electrode tab is disposed at a first side of the electrode assembly;   at least a portion of the second electrode tab is disposed at a second side of the electrode assembly; and   the second side is opposite to the first side along a vertical direction of the button-type secondary battery.